Stability of the Parent Anion of the Potential Radiosensitizer 8-Bromoadenine Formed by Low-Energy (<3 eV) Electron Attachment.

Stability of the Parent Anion of the Potential Radiosensitizer 8-Bromoadenine Formed by Low-Energy (<3 eV) Electron Attachment.
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低能 (<3 eV) 电子附着形成的潜在放射增敏剂 8-溴腺嘌呤母体阴离子的稳定性

DOI:
10.1021/acs.jpcb.7b02130
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发表时间:
2017
期刊:
The journal of physical chemistry. B
影响因子:
--
通讯作者:
I. Bald
I. Bald
中科院分区:
--
文献类型:
--
作者:
R. Schürmann;K. Tanzer;I. Dabkowska;S. Denifl;I. Bald

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8-溴腺苷(8-Bromoadenine, 8BrA)由于其与低能电子(LEEs)的有效相互作用,是一种潜在的用于癌症放射治疗的DNA放射增敏剂。LEEs是在癌症放射治疗中应用高能辐射对DNA进行辐射损伤时产生的一种短寿命物质。在气相中,电子与8bra的吸附产生了电子能低于3ev的稳定母阴离子,并产生了共振外环键裂解产生的碎片产物。8bra阴离子的密度功能理论(DFT)计算表明,溴与C8原子之间存在一个键长为2.6 Å的奇异键,其中大部分电荷位于溴原子上,自旋主要位于C8原子上。对核碱基类似物的这种长寿命阴离子状态的详细了解支持了新治疗剂的合理开发,其中增强解离电子向DNA主干的转移对于诱导癌组织中的DNA链断裂至关重要。
8-Bromoadenine (8BrA) is a potential DNA radiosensitizer for cancer radiation therapy due to its efficient interaction with low-energy electrons (LEEs). LEEs are a short-living species generated during the radiation damage of DNA by high-energy radiation as it is applied in cancer radiation therapy. Electron attachment to8BrA in the gas phase results in a stable parent anion below 3 eV electron energy in addition to fragmentation products formed by resonant exocyclic bond cleavages. Density functional theory (DFT) calculations of the8BrA–anion reveal an exotic bond between the bromine and the C8 atom with a bond length of 2.6 Å, where the majority of the charge is located on bromine and the spin is mainly located on the C8 atom. The detailed understanding of such long-lived anionic states of nucleobase analogues supports the rational development of new therapeutic agents, in which the enhancement of dissociative electron transfer to the DNA backbone is critical to induce DNA strand breaks in cancerous tissue.
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